/*!
 * Viewer v0.1.0
 * https://github.com/fengyuanchen/viewer
 *
 * Copyright (c) 2015 Fengyuan Chen
 * Released under the MIT license
 *
 * Date: 2015-09-02T09:08:17.666Z
 */

(function (factory) {
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as anonymous module.
        define('viewer', ['jquery'], factory);
    } else if (typeof exports === 'object') {
        // Node / CommonJS
        factory(require('jquery'));
    } else {
        // Browser globals.
        factory(jQuery);
    }
})(function ($) {

    'use strict';

    var $window = $(window);
    var $document = $(document);

    // Constants
    var NAMESPACE = 'viewer';
    var ELEMENT_VIEWER = document.createElement(NAMESPACE);

    // Classes
    var CLASS_TOGGLE = 'viewer-toggle';
    var CLASS_FIXED = 'viewer-fixed';
    var CLASS_OPEN = 'viewer-open';
    var CLASS_SHOW = 'viewer-show';
    var CLASS_HIDE = 'viewer-hide';
    var CLASS_FADE = 'viewer-fade';
    var CLASS_IN = 'viewer-in';
    var CLASS_MOVE = 'viewer-move';
    var CLASS_ACTIVE = 'viewer-active';
    var CLASS_INVISIBLE = 'viewer-invisible';
    var CLASS_TRANSITION = 'viewer-transition';
    var CLASS_FULLSCREEN = 'viewer-fullscreen';
    var CLASS_FULLSCREEN_EXIT = 'viewer-fullscreen-exit';
    var CLASS_CLOSE = 'viewer-close';

    // Selectors
    var SELECTOR_IMG = 'img';

    // Events
    var EVENT_MOUSEDOWN = 'mousedown touchstart pointerdown MSPointerDown';
    var EVENT_MOUSEMOVE = 'mousemove touchmove pointermove MSPointerMove';
    var EVENT_MOUSEUP = 'mouseup touchend touchcancel pointerup pointercancel MSPointerUp MSPointerCancel';
    var EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll';
    var EVENT_TRANSITIONEND = 'transitionend';
    var EVENT_LOAD = 'load.' + NAMESPACE;
    var EVENT_KEYDOWN = 'keydown.' + NAMESPACE;
    var EVENT_CLICK = 'click.' + NAMESPACE;
    var EVENT_RESIZE = 'resize.' + NAMESPACE;
    var EVENT_BUILD = 'build.' + NAMESPACE;
    var EVENT_BUILT = 'built.' + NAMESPACE;
    var EVENT_SHOW = 'show.' + NAMESPACE;
    var EVENT_SHOWN = 'shown.' + NAMESPACE;
    var EVENT_HIDE = 'hide.' + NAMESPACE;
    var EVENT_HIDDEN = 'hidden.' + NAMESPACE;
    var EVENT_VIEW = 'view.' + NAMESPACE;
    var EVENT_VIEWED = 'viewed.' + NAMESPACE;

    // Supports
    var SUPPORT_TRANSITION = typeof ELEMENT_VIEWER.style.transition !== 'undefined';

    // Others
    var round = Math.round;
    var sqrt = Math.sqrt;
    var abs = Math.abs;
    var min = Math.min;
    var max = Math.max;
    var num = parseFloat;

    // Prototype
    var prototype = {};

    function isString(s) {
        return typeof s === 'string';
    }

    function isNumber(n) {
        return typeof n === 'number' && !isNaN(n);
    }

    function isUndefined(u) {
        return typeof u === 'undefined';
    }

    function toArray(obj, offset) {
        var args = [];

        if (isNumber(offset)) { // It's necessary for IE8
            args.push(offset);
        }

        return args.slice.apply(obj, args);
    }

    // Custom proxy to avoid jQuery's guid
    function proxy(fn, context) {
        var args = toArray(arguments, 2);

        return function () {
            return fn.apply(context, args.concat(toArray(arguments)));
        };
    }

    function getTransform(options) {
        var transforms = [];
        var rotate = options.rotate;
        var scaleX = options.scaleX;
        var scaleY = options.scaleY;

        if (isNumber(rotate)) {
            transforms.push('rotate(' + rotate + 'deg)');
        }

        if (isNumber(scaleX) && isNumber(scaleY)) {
            transforms.push('scale(' + scaleX + ',' + scaleY + ')');
        }

        return transforms.length ? transforms.join(' ') : 'none';
    }

    // e.g.: http://domain.com/path/to/picture.jpg?size=1280×960 -> picture.jpg
    function getImageName(url) {
        return isString(url) ? url.replace(/^.*\//, '').replace(/[\?&#].*$/, '') : '';
    }

    function getImageSize(image, callback) {
        var newImage;

        // Modern browsers
        if (image.naturalWidth) {
            return callback(image.naturalWidth, image.naturalHeight);
        }

        // IE8: Don't use `new Image()` here
        newImage = document.createElement('img');

        newImage.onload = function () {
            callback(this.width, this.height);
        };

        newImage.src = image.src;
    }

    function Viewer(element, options) {
        this.$element = $(element);
        this.options = $.extend({}, Viewer.DEFAULTS, $.isPlainObject(options) && options);
        this.isImg = false;
        this.isBuilt = false;
        this.isShown = false;
        this.isViewed = false;
        this.isFulled = false;
        this.isPlayed = false;
        this.playing = false;
        this.fading = false;
        this.transitioning = false;
        this.action = false;
        this.target = false;
        this.index = 0;
        this.length = 0;
        this.init();
    }

    $.extend(prototype, {
        init: function () {
            var options = this.options;
            var $this = this.$element;
            var isImg = $this.is(SELECTOR_IMG);
            var $images = isImg ? $this : $this.find(SELECTOR_IMG);
            var length = $images.length;
            var ready = $.proxy(this.ready, this);

            if (!length) {
                return;
            }

            if ($.isFunction(options.build)) {
                $this.one(EVENT_BUILD, options.build);
            }

            if (this.trigger(EVENT_BUILD).isDefaultPrevented()) {
                return;
            }

            // Override `transiton` option if it is not supported
            if (!SUPPORT_TRANSITION) {
                options.transition = false;
            }

            this.isImg = isImg;
            this.length = length;
            this.count = 0;
            this.$images = $images;
            this.$body = $('body');

            if (options.inline) {
                $this.one(EVENT_BUILT, $.proxy(function () {
                    this.view();
                }, this));

                $images.each(function () {
                    if (this.complete) {
                        ready();
                    } else {
                        $(this).one(EVENT_LOAD, ready);
                    }
                });
            } else {
                $images.addClass(CLASS_TOGGLE);
                $this.on(EVENT_CLICK, $.proxy(this.start, this));
            }
        },

        ready: function () {
            this.count++;

            if (this.count === this.length) {
                this.build();
            }
        }
    });

    $.extend(prototype, {
        build: function () {
            var options = this.options;
            var $this = this.$element;
            var $parent;
            var $viewer;
            var $button;
            var $toolbar;

            if (this.isBuilt) {
                return;
            }

            if (!$parent || !$parent.length) {
                $parent = $this.parent();
            }

            this.$parent = $parent;
            this.$viewer = $viewer = $(Viewer.TEMPLATE);
            this.$canvas = $viewer.find('.viewer-canvas');
            this.$footer = $viewer.find('.viewer-footer');
            this.$title = $viewer.find('.viewer-title').toggleClass(CLASS_HIDE, !options.title);
            this.$toolbar = $toolbar = $viewer.find('.viewer-toolbar').toggleClass(CLASS_HIDE, !options.toolbar);
            this.$navbar = $viewer.find('.viewer-navbar').toggleClass(CLASS_HIDE, !options.navbar);
            this.$button = $button = $viewer.find('.viewer-button').toggleClass(CLASS_HIDE, !options.button);
            this.$tooltip = $viewer.find('.viewer-tooltip');
            this.$player = $viewer.find('.viewer-player');
            this.$list = $viewer.find('.viewer-list');

            $toolbar.find('li[class*=zoom]').toggleClass(CLASS_INVISIBLE, !options.zoomable);
            $toolbar.find('li[class*=flip]').toggleClass(CLASS_INVISIBLE, !options.scalable);

            if (!options.rotatable) {
                $toolbar.find('li[class*=rotate]').addClass(CLASS_INVISIBLE).appendTo($toolbar);
            }

            if (options.inline) {
                $button.addClass(CLASS_FULLSCREEN);
                $viewer.css('z-index', options.zIndexInline);

                if ($parent.css('position') === 'static') {
                    $parent.css('position', 'relative');
                }
            } else {
                $button.addClass(CLASS_CLOSE);
                $viewer.
          css('z-index', options.zIndex).
          addClass([CLASS_FIXED, CLASS_FADE, CLASS_HIDE].join(' '));
            }

            $this.after($viewer);
            //window.parent.$("body").append($viewer);

            if (options.inline) {
                this.render();
                this.bind();
                this.isShown = true;
            }

            this.isBuilt = true;

            if ($.isFunction(options.built)) {
                $this.one(EVENT_BUILT, options.built);
            }
            this.trigger(EVENT_BUILT);
        },

        unbuild: function () {
            var options = this.options;
            var $this = this.$element;

            if (!this.isBuilt) {
                return;
            }

            if (options.inline && !options.container) {
                $this.removeClass(CLASS_HIDE);
            }

            this.$viewer.remove();
        }
    });

    $.extend(prototype, {
        bind: function () {
            this.$viewer.
        on(EVENT_CLICK, $.proxy(this.click, this)).
        on(EVENT_WHEEL, $.proxy(this.wheel, this));

            this.$canvas.on(EVENT_MOUSEDOWN, $.proxy(this.mousedown, this));

            $document.
        on(EVENT_MOUSEMOVE, (this._mousemove = proxy(this.mousemove, this))).
        on(EVENT_MOUSEUP, (this._mouseup = proxy(this.mouseup, this))).
        on(EVENT_KEYDOWN, (this._keydown = proxy(this.keydown, this)));

            $window.on(EVENT_RESIZE, (this._resize = proxy(this.resize, this)));
        },

        unbind: function () {
            this.$viewer.
        off(EVENT_CLICK, this.click).
        off(EVENT_WHEEL, this.wheel);

            this.$canvas.off(EVENT_MOUSEDOWN, this.mousedown);

            $document.
        off(EVENT_MOUSEMOVE, this._mousemove).
        off(EVENT_MOUSEUP, this._mouseup).
        off(EVENT_KEYDOWN, this._keydown);

            $window.off(EVENT_RESIZE, this._resize);
        }
    });

    $.extend(prototype, {
        render: function () {
            this.initContainer();
            this.initViewer();
            this.initList();
            this.renderViewer();
        },

        initContainer: function () {
            this.container = {
                width: $window.innerWidth(),
                height: $window.innerHeight()
            };
        },

        initViewer: function () {
            var options = this.options;
            var $parent = this.$parent;
            var viewer;

            if (options.inline) {
                this.parent = viewer = {
                    width: max($parent.width(), options.minWidth),
                    height: max($parent.height(), options.minHeight)
                };
            }

            if (this.isFulled || !viewer) {
                viewer = this.container;
            }

            this.viewer = $.extend({}, viewer);
        },

        renderViewer: function () {
            if (this.options.inline && !this.isFulled) {
                this.$viewer.css(this.viewer);
            }
        },

        initList: function () {
            var options = this.options;
            var $this = this.$element;
            var $list = this.$list;
            var list = [];

            this.$images.each(function (i) {
                var src = this.src;
                var alt = this.alt || getImageName(src);
                var url = options.url;

                if (!src) {
                    return;
                }

                if (isString(url)) {
                    url = this.getAttribute(url);
                } else if ($.isFunction(url)) {
                    url = url.call(this, this);
                }

                list.push(
          '<li>' +
            '<img' +
              ' src="' + src + '"' +
              ' data-action="view"' +
              ' data-index="' + i + '"' +
              ' data-original-url="' + (url || src) + '"' +
              ' alt="' + alt + '"' +
            '>' +
          '</li>'
        );
            });

            $list.html(list.join('')).find(SELECTOR_IMG).one(EVENT_LOAD, {
                filled: true
            }, $.proxy(this.loadImage, this));

            this.$items = $list.children();

            if (options.transition) {
                $this.one(EVENT_VIEWED, function () {
                    $list.addClass(CLASS_TRANSITION);
                });
            }
        },

        renderList: function (index) {
            var i = index || this.index;
            var width = this.$items.eq(i).width();
            var outerWidth = width + 1; // 1 pixel of `margin-left` width

            // Place the active item in the center of the screen
            this.$list.css({
                width: outerWidth * this.length,
                marginLeft: (this.viewer.width - width) / 2 - outerWidth * i
            });
        },

        resetList: function () {
            this.$list.empty().removeClass(CLASS_TRANSITION).css('margin-left', 0);
        },

        initImage: function (callback) {
            var options = this.options;
            var $image = this.$image;
            var viewer = this.viewer;
            var footerHeight = this.$footer.height();
            var viewerWidth = viewer.width;
            var viewerHeight = max(viewer.height - footerHeight, footerHeight);
            var oldImage = this.image || {};

            getImageSize($image[0], $.proxy(function (naturalWidth, naturalHeight) {
                var aspectRatio = naturalWidth / naturalHeight;
                var width = viewerWidth;
                var height = viewerHeight;
                var initialImage;
                var image;

                if (viewerHeight * aspectRatio > viewerWidth) {
                    height = viewerWidth / aspectRatio;
                } else {
                    width = viewerHeight * aspectRatio;
                }

                width = min(width * 0.9, naturalWidth);
                height = min(height * 0.9, naturalHeight);

                image = {
                    naturalWidth: naturalWidth,
                    naturalHeight: naturalHeight,
                    aspectRatio: aspectRatio,
                    ratio: width / naturalWidth,
                    width: width,
                    height: height,
                    left: (viewerWidth - width) / 2,
                    top: (viewerHeight - height) / 2
                };

                initialImage = $.extend({}, image);

                if (options.rotatable) {
                    image.rotate = oldImage.rotate || 0;
                    initialImage.rotate = 0;
                }

                if (options.scalable) {
                    image.scaleX = oldImage.scaleX || 1;
                    image.scaleY = oldImage.scaleY || 1;
                    initialImage.scaleX = 1;
                    initialImage.scaleY = 1;
                }

                this.image = image;
                this.initialImage = initialImage;

                if ($.isFunction(callback)) {
                    callback();
                }
            }, this));
        },

        renderImage: function (callback) {
            var image = this.image;
            var $image = this.$image;

            $image.css({
                width: image.width,
                height: image.height,
                marginLeft: image.left,
                marginTop: image.top,
                transform: getTransform(image)
            });

            if ($.isFunction(callback)) {
                if (this.options.transition) {
                    $image.one(EVENT_TRANSITIONEND, callback);
                } else {
                    callback();
                }
            }
        },

        resetImage: function () {
            this.$image.remove();
            this.$image = null;
        }
    });

    $.extend(prototype, {
        start: function (e) {
            var target = e.target;

            if ($(target).hasClass(CLASS_TOGGLE)) {
                this.target = target;
                this.show();
            }
        },

        click: function (e) {
            var $target = $(e.target);
            var action = $target.data('action');
            var image = this.image;

            switch (action) {
                case 'mix':
                    if (this.isPlayed) {
                        this.stop();
                    } else {
                        if (this.options.inline) {
                            if (this.isFulled) {
                                this.exit();
                            } else {
                                this.full();
                            }
                        } else {
                            this.hide();
                        }
                    }

                    break;

                case 'view':
                    this.view($target.data('index'));
                    break;

                case 'zoom-in':
                    this.zoom(0.1, true);
                    break;

                case 'zoom-out':
                    this.zoom(-0.1, true);
                    break;

                case 'one-to-one':
                    if (this.image.ratio === 1) {
                        this.zoomTo(this.initialImage.ratio);
                    } else {
                        this.zoomTo(1);
                    }

                    break;

                case 'reset':
                    this.reset();
                    break;

                case 'prev':
                    this.prev();
                    break;

                case 'play':
                    this.play();
                    break;

                case 'next':
                    this.next();
                    break;

                case 'rotate-left':
                    this.rotate(-90);
                    break;

                case 'rotate-right':
                    this.rotate(90);
                    break;

                case 'flip-horizontal':
                    this.scale(-image.scaleX || -1, image.scaleY || 1);
                    break;

                case 'flip-vertical':
                    this.scale(image.scaleX || 1, -image.scaleY || -1);
                    break;

                default:
                    if (this.isPlayed) {
                        this.stop();
                    }
            }
        },

        load: function () {
            this.initImage($.proxy(function () {
                this.renderImage($.proxy(function () {
                    this.isViewed = true;
                    this.trigger(EVENT_VIEWED);
                }, this));
            }, this));
        },

        loadImage: function (e) {
            var image = e.target;
            var $image = $(image);
            var $parent = $image.parent();
            var parentWidth = $parent.width();
            var parentHeight = $parent.height();
            var filled = e.data && e.data.filled;

            getImageSize(image, $.proxy(function (naturalWidth, naturalHeight) {
                var aspectRatio = naturalWidth / naturalHeight;
                var width = parentWidth;
                var height = parentHeight;

                if (parentHeight * aspectRatio > parentWidth) {
                    if (filled) {
                        width = parentHeight * aspectRatio;
                    } else {
                        height = parentWidth / aspectRatio;
                    }
                } else {
                    if (filled) {
                        height = parentWidth / aspectRatio;
                    } else {
                        width = parentHeight * aspectRatio;
                    }
                }

                $image.css({
                    width: width,
                    height: height,
                    marginLeft: (parentWidth - width) / 2,
                    marginTop: (parentHeight - height) / 2
                });
            }, this));
        },

        resize: function () {
            this.initContainer();
            this.initViewer();
            this.renderViewer();
            this.renderList();
            this.initImage($.proxy(function () {
                this.renderImage();
            }, this));

            if (this.isPlayed) {
                this.$player.
          find(SELECTOR_IMG).
          one(EVENT_LOAD, $.proxy(this.loadImage, this)).
          trigger(EVENT_LOAD);
            }
        },

        wheel: function (event) {
            var e = event.originalEvent;
            var ratio = num(this.options.zoomRatio) || 0.1;
            var delta = 1;

            if (!this.isViewed) {
                return;
            }

            event.preventDefault();

            if (e.deltaY) {
                delta = e.deltaY > 0 ? 1 : -1;
            } else if (e.wheelDelta) {
                delta = -e.wheelDelta / 120;
            } else if (e.detail) {
                delta = e.detail > 0 ? 1 : -1;
            }

            this.zoom(-delta * ratio, true);
        },

        keydown: function (e) {
            var options = this.options;
            var which = e.which;

            if (!this.isFulled || !options.keyboard) {
                return;
            }

            switch (which) {

                // (Key: Esc)    
                case 27:
                    if (this.isPlayed) {
                        this.stop();
                    } else {
                        if (options.inline) {
                            if (this.isFulled) {
                                this.exit();
                            }
                        } else {
                            this.hide();
                        }
                    }

                    break;

                // View previous (Key: ←)    
                case 37:
                    this.prev();
                    break;

                // Zoom in (Key: ↑)    
                case 38:
                    this.zoom(options.zoomRatio, true);
                    break;

                // View next (Key: →)    
                case 39:
                    this.next();
                    break;

                // Zoom out (Key: ↓)    
                case 40:
                    this.zoom(-options.zoomRatio, true);
                    break;

                // Zoom out to initial size (Key: Ctrl + 0)    
                case 48:
                    // Go to next

                    // Zoom in to natural size (Key: Ctrl + 1)
                case 49:
                    if (e.ctrlKey || e.shiftKey) {
                        e.preventDefault();

                        if (this.image.ratio === 1) {
                            this.zoomTo(this.initialImage.ratio);
                        } else {
                            this.zoomTo(1);
                        }
                    }

                    break;

                // No default    
            }
        },

        mousedown: function (event) {
            var options = this.options;
            var originalEvent = event.originalEvent;
            var touches = originalEvent && originalEvent.touches;
            var e = event;
            var action = options.movable ? 'move' : false;
            var touchesLength;

            if (!this.isViewed) {
                return;
            }

            if (touches) {
                touchesLength = touches.length;

                if (touchesLength > 1) {
                    if (options.zoomable && touchesLength === 2) {
                        e = touches[1];
                        this.startX2 = e.pageX;
                        this.startY2 = e.pageY;
                        action = 'zoom';
                    } else {
                        return;
                    }
                } else {
                    if (this.isSwitchable()) {
                        action = 'switch';
                    }
                }

                e = touches[0];
            }

            if (action) {
                event.preventDefault();

                if (action === 'move' && options.transition) {
                    this.$image.removeClass(CLASS_TRANSITION);
                }

                this.action = action;

                // IE8  has `event.pageX/Y`, but not `event.originalEvent.pageX/Y`
                // IE10 has `event.originalEvent.pageX/Y`, but not `event.pageX/Y`
                this.startX = e.pageX || originalEvent && originalEvent.pageX;
                this.startY = e.pageY || originalEvent && originalEvent.pageY;
            }
        },

        mousemove: function (event) {
            var options = this.options;
            var originalEvent = event.originalEvent;
            var touches = originalEvent && originalEvent.touches;
            var e = event;
            var touchesLength;

            if (!this.isViewed) {
                return;
            }

            if (touches) {
                touchesLength = touches.length;

                if (touchesLength > 1) {
                    if (options.zoomable && touchesLength === 2) {
                        e = touches[1];
                        this.endX2 = e.pageX;
                        this.endY2 = e.pageY;
                    } else {
                        return;
                    }
                }

                e = touches[0];
            }

            if (this.action) {
                event.preventDefault();

                this.endX = e.pageX || originalEvent && originalEvent.pageX;
                this.endY = e.pageY || originalEvent && originalEvent.pageY;

                this.change();
            }
        },

        mouseup: function (event) {
            var action = this.action;

            if (action) {
                event.preventDefault();

                if (action === 'move' && this.options.transition) {
                    this.$image.addClass(CLASS_TRANSITION);
                }

                this.action = false;
            }
        }
    });

    $.extend(prototype, {

        // Show the viewer (only available in modal mode)
        show: function () {
            var options = this.options;
            var $viewer;

            if (options.inline || this.transitioning) {
                return;
            }

            if (!this.isBuilt) {
                this.build();
            }

            if ($.isFunction(options.show)) {
                this.$element.one(EVENT_SHOW, options.show);
            }

            if (this.trigger(EVENT_SHOW).isDefaultPrevented()) {
                return;
            }

            this.$body.addClass(CLASS_OPEN);
            $viewer = this.$viewer.removeClass(CLASS_HIDE);

            this.$element.one(EVENT_SHOWN, $.proxy(function () {
                this.view((this.target ? this.$images.index(this.target) : 0) || this.index);
                this.target = false;
            }, this));
            if (options.transition) {
                this.transitioning = true;

                /* jshint expr:true */
                $viewer.addClass(CLASS_TRANSITION).get(0).offsetWidth;
                $viewer.one(EVENT_TRANSITIONEND, $.proxy(this.shown, this)).addClass(CLASS_IN);
            } else {
                $viewer.addClass(CLASS_IN);
                this.shown();
            }
        },

        // Hide the viewer (only available in modal mode)
        hide: function () {
            var options = this.options;
            var $viewer = this.$viewer;

            if (options.inline || this.transitioning || !this.isShown) {
                return;
            }

            if ($.isFunction(options.hide)) {
                this.$element.one(EVENT_HIDE, options.hide);
            }

            if (this.trigger(EVENT_HIDE).isDefaultPrevented()) {
                return;
            }

            if (this.isViewed && options.transition) {
                this.transitioning = true;
                this.$image.one(EVENT_TRANSITIONEND, $.proxy(function () {
                    $viewer.one(EVENT_TRANSITIONEND, $.proxy(this.hidden, this)).removeClass(CLASS_IN);
                }, this));
                this.zoomTo(0, false, true);
            } else {
                $viewer.removeClass(CLASS_IN);
                this.hidden();
            }
        },

        /**
        * View one of the images with image's index
        *
        * @param {Number} index
        */
        view: function (index) {
            var options = this.options;
            var viewer = this.viewer;
            var $title = this.$title;
            var $image;
            var $item;
            var $img;
            var url;
            var alt;

            index = Number(index) || 0;

            if (!this.isShown || this.isPlayed || index < 0 || index >= this.length ||
        this.isViewed && index === this.index) {
                return;
            }

            if (this.trigger(EVENT_VIEW).isDefaultPrevented()) {
                return;
            }

            $item = this.$items.eq(index);
            $img = $item.find(SELECTOR_IMG);
            url = $img.data('originalUrl');
            alt = $img.attr('alt');

            this.$image = $image = $('<img src="' + url + '" alt="' + alt + '">');

            $image.
        toggleClass(CLASS_TRANSITION, options.transition).
        toggleClass(CLASS_MOVE, options.movable).
        css({
            width: 0,
            height: 0,
            marginLeft: viewer.width / 2,
            marginTop: viewer.height / 2
        });

            this.$items.eq(this.index).removeClass(CLASS_ACTIVE);
            $item.addClass(CLASS_ACTIVE);

            this.isViewed = false;
            this.index = index;
            this.image = null;
            $image.one(EVENT_LOAD, $.proxy(this.load, this));
            this.$canvas.html($image);
            $title.empty();

            // Center current item
            this.renderList();

            // Show title when viewed
            this.$element.one(EVENT_VIEWED, $.proxy(function () {
                var image = this.image;
                var width = image.naturalWidth;
                var height = image.naturalHeight;

                $title.html(alt + ' (' + width + ' &times; ' + height + ')');
            }, this));
        },

        // View the previous image
        prev: function () {
            this.view(max(this.index - 1, 0));
        },

        // View the next image
        next: function () {
            this.view(min(this.index + 1, this.length - 1));
        },

        /**
        * Move the image
        *
        * @param {Number} offsetX
        * @param {Number} offsetY (optional)
        */
        move: function (offsetX, offsetY) {
            var image = this.image;

            // If "offsetY" is not present, its default value is "offsetX"
            if (isUndefined(offsetY)) {
                offsetY = offsetX;
            }

            offsetX = num(offsetX);
            offsetY = num(offsetY);

            if (this.isShown && !this.isPlayed && this.options.movable) {
                image.left += isNumber(offsetX) ? offsetX : 0;
                image.top += isNumber(offsetY) ? offsetY : 0;
                this.renderImage();
            }
        },

        /**
        * Zoom the image
        *
        * @param {Number} ratio
        * @param {Boolean} hasTooltip (optional)
        */
        zoom: function (ratio, hasTooltip) {
            var options = this.options;
            var minZoomRatio = max(0.01, options.minZoomRatio);
            var maxZoomRatio = min(100, options.maxZoomRatio);
            var image = this.image;
            var width;
            var height;

            ratio = num(ratio);

            if (isNumber(ratio) && this.isShown && !this.isPlayed && options.zoomable) {
                if (ratio < 0) {
                    ratio = 1 / (1 - ratio);
                } else {
                    ratio = 1 + ratio;
                }

                width = image.width * ratio;
                height = image.height * ratio;
                ratio = width / image.naturalWidth;
                ratio = min(max(ratio, minZoomRatio), maxZoomRatio);

                if (ratio > 0.95 && ratio < 1.05) {
                    ratio = 1;
                    width = image.naturalWidth;
                    height = image.naturalHeight;
                }

                image.left -= (width - image.width) / 2;
                image.top -= (height - image.height) / 2;
                image.width = width;
                image.height = height;
                image.ratio = ratio;
                this.renderImage();

                if (hasTooltip) {
                    this.tooltip();
                }
            }
        },

        /**
        * Zoom the image to a special ratio
        *
        * @param {Number} ratio
        * @param {Boolean} hasTooltip (optional)
        * @param {Boolean} _zoomable (private)
        */
        zoomTo: function (ratio, hasTooltip, _zoomable) {
            var image = this.image;
            var width;
            var height;

            ratio = max(ratio, 0);

            if (isNumber(ratio) && this.isShown && !this.isPlayed && (_zoomable || this.options.zoomable)) {
                width = image.naturalWidth * ratio;
                height = image.naturalHeight * ratio;
                image.left -= (width - image.width) / 2;
                image.top -= (height - image.height) / 2;
                image.width = width;
                image.height = height;
                image.ratio = ratio;
                this.renderImage();

                if (hasTooltip) {
                    this.tooltip();
                }
            }
        },

        /**
        * Rotate the image
        * https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function#rotate()
        *
        * @param {Number} degrees
        */
        rotate: function (degrees) {
            var image = this.image;

            degrees = num(degrees);

            if (isNumber(degrees) && this.isShown && !this.isPlayed && this.options.rotatable) {
                image.rotate = ((image.rotate || 0) + degrees);
                this.renderImage();
            }
        },

        /**
        * Rotate the image to a special angle
        *
        * @param {Number} degrees
        */
        rotateTo: function (degrees) {
            var image = this.image;

            degrees = num(degrees);

            if (isNumber(degrees) && this.isShown && !this.isPlayed && this.options.rotatable) {
                image.rotate = degrees;
                this.renderImage();
            }
        },

        /**
        * Scale the image
        * https://developer.mozilla.org/en-US/docs/Web/CSS/transform-function#scale()
        *
        * @param {Number} scaleX
        * @param {Number} scaleY (optional)
        */
        scale: function (scaleX, scaleY) {
            var image = this.image;

            // If "scaleY" is not present, its default value is "scaleX"
            if (isUndefined(scaleY)) {
                scaleY = scaleX;
            }

            scaleX = num(scaleX);
            scaleY = num(scaleY);

            if (this.isShown && !this.isPlayed && this.options.scalable) {
                image.scaleX = isNumber(scaleX) ? scaleX : 1;
                image.scaleY = isNumber(scaleY) ? scaleY : 1;
                this.renderImage();
            }
        },

        /**
        * Scale the abscissa of the image
        *
        * @param {Number} scaleX
        */
        scaleX: function (scaleX) {
            this.scale(scaleX, this.image.scaleY);
        },

        /**
        * Scale the ordinate of the image
        *
        * @param {Number} scaleY
        */
        scaleY: function (scaleY) {
            this.scale(this.image.scaleX, scaleY);
        },

        // Play the images
        play: function () {
            var options = this.options;
            var $player = this.$player;
            var load = $.proxy(this.loadImage, this);
            var list = [];
            var total = 0;
            var index = 0;
            var playing;

            if (!this.isShown || this.isPlayed) {
                return;
            }

            if (options.fullscreen) {
                this.fullscreen();
            }

            this.isPlayed = true;
            $player.addClass(CLASS_SHOW);

            this.$items.each(function (i) {
                var $this = $(this);
                var $img = $this.find(SELECTOR_IMG);
                var $image = $('<img src="' + $img.data('originalUrl') + '" alt="' + $img.attr('alt') + '">');

                total++;

                $image.addClass(CLASS_FADE).toggleClass(CLASS_TRANSITION, options.transition);

                if ($this.hasClass(CLASS_ACTIVE)) {
                    $image.addClass(CLASS_IN);
                    index = i;
                }

                list.push($image);
                $image.one(EVENT_LOAD, {
                    filled: false
                }, load);
                $player.append($image);
            });

            if (isNumber(options.interval) && options.interval > 0) {
                playing = $.proxy(function () {
                    this.playing = setTimeout(function () {
                        list[index].removeClass(CLASS_IN);
                        index++;
                        index = index < total ? index : 0;
                        list[index].addClass(CLASS_IN);

                        playing();
                    }, options.interval);
                }, this);

                if (total > 1) {
                    playing();
                }
            }
        },

        // Stop play
        stop: function () {
            if (!this.isPlayed) {
                return;
            }

            this.isPlayed = false;
            clearTimeout(this.playing);
            this.$player.removeClass(CLASS_SHOW).empty();
        },

        // Enter modal mode (only available in inline mode)
        full: function () {
            var options = this.options;
            var $image = this.$image;
            var $list = this.$list;

            if (!this.isShown || this.isPlayed || this.isFulled || !options.inline) {
                return;
            }

            this.isFulled = true;
            this.$body.addClass(CLASS_OPEN);
            this.$button.addClass(CLASS_FULLSCREEN_EXIT);

            if (options.transition) {
                $image.removeClass(CLASS_TRANSITION);
                $list.removeClass(CLASS_TRANSITION);
            }

            this.$viewer.addClass(CLASS_FIXED).removeAttr('style').css('z-index', options.zIndex);
            this.initContainer();
            this.viewer = $.extend({}, this.container);
            this.renderList();
            this.initImage($.proxy(function () {
                this.renderImage(function () {
                    if (options.transition) {
                        setTimeout(function () {
                            $image.addClass(CLASS_TRANSITION);
                            $list.addClass(CLASS_TRANSITION);
                        }, 0);
                    }
                });
            }, this));
        },

        // Exit modal mode (only available in inline mode)
        exit: function () {
            var options = this.options;
            var $image = this.$image;
            var $list = this.$list;

            if (!this.isFulled) {
                return;
            }

            this.isFulled = false;
            this.$body.removeClass(CLASS_OPEN);
            this.$button.removeClass(CLASS_FULLSCREEN_EXIT);

            if (options.transition) {
                $image.removeClass(CLASS_TRANSITION);
                $list.removeClass(CLASS_TRANSITION);
            }

            this.$viewer.removeClass(CLASS_FIXED).css('z-index', options.zIndexInline);
            this.viewer = $.extend({}, this.parent);
            this.renderViewer();
            this.renderList();
            this.initImage($.proxy(function () {
                this.renderImage(function () {
                    if (options.transition) {
                        setTimeout(function () {
                            $image.addClass(CLASS_TRANSITION);
                            $list.addClass(CLASS_TRANSITION);
                        }, 0);
                    }
                });
            }, this));
        },

        // Show the current ratio of the image with percentage
        tooltip: function () {
            var options = this.options;
            var $tooltip = this.$tooltip;
            var image = this.image;
            var classes = [
            CLASS_SHOW,
            CLASS_FADE,
            CLASS_TRANSITION
          ].join(' ');

            if (!this.isShown || this.isPlayed || !options.tooltip) {
                return;
            }

            $tooltip.text(round(image.ratio * 100) + '%');

            if (!this.fading) {
                if (options.transition) {

                    /* jshint expr:true */
                    $tooltip.addClass(classes).get(0).offsetWidth;
                    $tooltip.addClass(CLASS_IN);
                } else {
                    $tooltip.addClass(CLASS_SHOW);
                }
            } else {
                clearTimeout(this.fading);
            }

            this.fading = setTimeout($.proxy(function () {
                if (options.transition) {
                    $tooltip.one(EVENT_TRANSITIONEND, function () {
                        $tooltip.removeClass(classes);
                    }).removeClass(CLASS_IN);
                } else {
                    $tooltip.removeClass(CLASS_SHOW);
                }

                this.fading = false;
            }, this), 1000);
        },

        // Toggle the image size between its natural size and initial size.
        toggle: function () {
            if (this.image.ratio === 1) {
                this.zoomTo(this.initialImage.ratio);
            } else {
                this.zoomTo(1);
            }
        },

        // Reset the image to its initial state.
        reset: function () {
            if (this.isShown && !this.isPlayed) {
                this.image = $.extend({}, this.initialImage);
                this.renderImage();
            }
        },

        // Destroy the viewer
        destroy: function () {
            var $this = this.$element;

            if (this.options.inline) {
                this.unbind();
            } else {
                if (this.isShown) {
                    this.unbind();
                }

                this.$images.removeClass(CLASS_TOGGLE);
                $this.off(EVENT_CLICK, this.start);
            }

            this.unbuild();
            $this.removeData(NAMESPACE);
        }
    });

    $.extend(prototype, {

        // A shortcut for triggering custom events
        trigger: function (type, data) {
            var e = $.Event(type, data);

            this.$element.trigger(e);

            return e;
        },

        shown: function () {
            var options = this.options;

            this.transitioning = false;
            this.isFulled = true;
            this.isShown = true;
            this.isVisible = true;
            this.render();
            this.bind();

            if ($.isFunction(options.shown)) {
                this.$element.one(EVENT_SHOWN, options.shown);
            }

            this.trigger(EVENT_SHOWN);
        },

        hidden: function () {
            var options = this.options;

            this.transitioning = false;
            this.isViewed = false;
            this.isFulled = false;
            this.isShown = false;
            this.isVisible = false;
            this.unbind();
            this.$body.removeClass(CLASS_OPEN);
            this.$viewer.addClass(CLASS_HIDE);
            this.resetList();
            this.resetImage();

            if ($.isFunction(options.hidden)) {
                this.$element.one(EVENT_HIDDEN, options.hidden);
            }

            this.trigger(EVENT_HIDDEN);
        },

        fullscreen: function () {
            var documentElement = document.documentElement;

            if (this.isFulled && !document.fullscreenElement && !document.mozFullScreenElement &&
        !document.webkitFullscreenElement && !document.msFullscreenElement) {

                if (documentElement.requestFullscreen) {
                    documentElement.requestFullscreen();
                } else if (documentElement.msRequestFullscreen) {
                    documentElement.msRequestFullscreen();
                } else if (documentElement.mozRequestFullScreen) {
                    documentElement.mozRequestFullScreen();
                } else if (documentElement.webkitRequestFullscreen) {
                    documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
                }
            }
        },

        change: function () {
            var offsetX = this.endX - this.startX;
            var offsetY = this.endY - this.startY;

            switch (this.action) {

                // Move the current image    
                case 'move':
                    this.move(offsetX, offsetY);
                    break;

                // Zoom the current image    
                case 'zoom':
                    this.zoom(function (x1, y1, x2, y2) {
                        var z1 = sqrt(x1 * x1 + y1 * y1);
                        var z2 = sqrt(x2 * x2 + y2 * y2);

                        return (z2 - z1) / z1;
                    } (
            abs(this.startX - this.startX2),
            abs(this.startY - this.startY2),
            abs(this.endX - this.endX2),
            abs(this.endY - this.endY2)
          ));

                    this.startX2 = this.endX2;
                    this.startY2 = this.endY2;
                    break;

                case 'switch':
                    this.action = 'switched';

                    if (offsetX > 1) {
                        this.prev();
                    } else if (offsetX < -1) {
                        this.next();
                    }

                    break;

                // No default    
            }

            // Override
            this.startX = this.endX;
            this.startY = this.endY;
        },

        isSwitchable: function () {
            var image = this.image;
            var viewer = this.viewer;

            return (image.left >= 0 && image.top >= 0 && image.width <= viewer.width &&
        image.height <= viewer.height);
        }
    });

    $.extend(Viewer.prototype, prototype);

    Viewer.DEFAULTS = {
        // Enable inline mode
        inline: false,

        // Show the button on the top-right of the viewer
        button: true,

        // Show the navbar
        navbar: true,

        // Show the title
        title: true,

        // Show the toolbar
        toolbar: true,

        // Show the tooltip with image ratio (percentage) when zoom in or zoom out
        tooltip: true,

        // Enable to move the image
        movable: true,

        // Enable to zoom the image
        zoomable: true,

        // Enable to rotate the image
        rotatable: true,

        // Enable to scale the image
        scalable: true,

        // Enable CSS3 Transition for some special elements
        transition: true,

        // Enable to request fullscreen when play
        fullscreen: true,

        // Enable keyboard support
        keyboard: true,

        // Define interval of each image when playing
        interval: 5000,

        // Min width of the viewer in inline mode
        minWidth: 200,

        // Min height of the viewer in inline mode
        minHeight: 100,

        // Define the ratio when zoom the image by wheeling mouse
        zoomRatio: 0.1,

        // Define the min ratio of the image when zoom out
        minZoomRatio: 0.01,

        // Define the max ratio of the image when zoom in
        maxZoomRatio: 100,

        // Define the CSS `z-index` value of viewer in modal mode.
        zIndex: 2015,

        // Define the CSS `z-index` value of viewer in inline mode.
        zIndexInline: 0,

        // Define where to get the original image URL for viewing
        // Type: String (an image attribute) or Function (should return an image URL)
        url: 'src',

        // Event shortcuts
        build: null,
        built: null,
        show: null,
        shown: null,
        hide: null,
        hidden: null
    };

    Viewer.TEMPLATE = (
    '<div class="viewer-container">' +
      '<div class="viewer-canvas"></div>' +
      '<div class="viewer-footer">' +
        '<div class="viewer-title"></div>' +
        '<ul class="viewer-toolbar">' +
          '<li class="viewer-zoom-in" data-action="zoom-in"></li>' +
          '<li class="viewer-zoom-out" data-action="zoom-out"></li>' +
          '<li class="viewer-one-to-one" data-action="one-to-one"></li>' +
          '<li class="viewer-reset" data-action="reset"></li>' +
          '<li class="viewer-prev" data-action="prev"></li>' +
          '<li class="viewer-play" data-action="play"></li>' +
          '<li class="viewer-next" data-action="next"></li>' +
          '<li class="viewer-rotate-left" data-action="rotate-left"></li>' +
          '<li class="viewer-rotate-right" data-action="rotate-right"></li>' +
          '<li class="viewer-flip-horizontal" data-action="flip-horizontal"></li>' +
          '<li class="viewer-flip-vertical" data-action="flip-vertical"></li>' +
        '</ul>' +
        '<div class="viewer-navbar">' +
          '<ul class="viewer-list"></ul>' +
        '</div>' +
      '</div>' +
      '<div class="viewer-tooltip"></div>' +
      '<div class="viewer-button" data-action="mix"></div>' +
      '<div class="viewer-player"></div>' +
    '</div>'
  );

    // Save the other viewer
    Viewer.other = $.fn.viewer;

    // Register as jQuery plugin
    $.fn.viewer = function (options) {
        var args = toArray(arguments, 1);
        var result;

        this.each(function () {
            var $this = $(this);
            var data = $this.data(NAMESPACE);
            var fn;

            if (!data) {
                if (/destroy|hide|exit|stop|reset/.test(options)) {
                    return;
                }

                $this.data(NAMESPACE, (data = new Viewer(this, options)));
            }

            if (isString(options) && $.isFunction(fn = data[options])) {
                result = fn.apply(data, args);
            }
        });

        return isUndefined(result) ? this : result;
    };

    $.fn.viewer.Constructor = Viewer;
    $.fn.viewer.setDefaults = Viewer.setDefaults;

    // No conflict
    $.fn.viewer.noConflict = function () {
        $.fn.viewer = Viewer.other;
        return this;
    };

});
